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Intrinsic tunneling spectroscopy in high magnetic field (H) is used for a direct test of superconducting features in the quasiparticle density of states of pure Bi2212 and intercalated HgBr2-Bi2212 high- T(c) superconductors. We were able to distinguish with great clarity two coexisting gaps: (i) the superconducting gap, which closes as H--&gt;H(c2)(T), and (ii) the c-axis pseudogap, which does not change either with H or with T. Strikingly different H dependencies, together with previously observed different temperature dependencies of the two gaps, speak against a superconducting origin of the pseudogap.

physical review letters

Magnetic Field Dependence of the Superconducting Gap and the Pseudogap in Bi2212 and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>HgBr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>-Bi2212, Studied by Intrinsic Tunneling Spectroscopy

Magnetic Field Dependence of the Superconducting Gap and the Pseudogap in Bi2212 andHgBr2-Bi2212, Studied by Intrinsic Tunneling Spectroscopy